What EXACTLY is the infection in Left 4 Dead?

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No one actually explains what the infection or "Green Flu" is and what it does. Here's my first in-depth analysis video. I don't feel like I covered nearly enough on this topic, so let me know what else you would like to know! BIG THANKS to the Left 4 Dead Wikia: http://left4dead.wikia.com/wiki/Green_Flu T-SHIRTS AND MERCH AVAILABLE HERE: http://rdbl.co/2ybCQ39 ____Social Media!____ Facebook: http://bit.ly/2ybo5xi Twitch: https://www.twitch.tv/w0wsuchgaming Twitter: https://twitter.com/Wow_Such_Gaming PATREON: http://bit.ly/2wo2GfI ____Friends Channels!____ Cake Slayer: http://bit.ly/2wnzohu DJ Timevoid: http://bit.ly/2xPaCKv Nanogerm: https://www.youtube.com/user/godnickl Beejie Bean: http://bit.ly/2xQcymk Wow Such Gaming streams: http://bit.ly/2yc1XCV ____Music Talents!____ Background music by Ghost Memories (Ryan Torres): https://soundcloud.com/ghost_memories ========================= Coaching Theme track- Run on by Zack Haygood: https://www.facebook.com/zack.haygood.9w